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Northstar Engines and System Technical Discussion Discussion, Northstar Smoke On Startup in Cadillac Engine Technical Discussion; It's either coolant, oil or gas....
  1. #16
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: Northstar Smoke On Startup

    It's either coolant, oil or gas.

  2. #17
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    Quote Originally Posted by Ranger
    It's either coolant, oil or gas.
    Sorry but I had to. It's fuel, but I don't know what's causing it.


    image-2547931589.jpg

  3. #18
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    Re: Northstar Smoke On Startup

    Well, you said you could not tell what it was.

    If it's gas, it's one of two things. Either a ruptured FPR diaphragm (most likely) or a leaky/stuck open fuel injector (least likely).

  4. #19
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    Quote Originally Posted by Ranger
    If it's gas, it's one of two things. Either a ruptured FPR diaphragm (most likely) or a leaky/stuck open fuel injector (least likely).
    I have a fuel injector going out. I have to unplug it and tap it with a screw driver about once or twice a week. It does not make a healthy tick like the other 7 but makes a lose slap, so that's a good possibility. How would I check the fuel pressure regulator?

    ----------

    Quote Originally Posted by Ranger
    Well, you said you could not tell what it was.

    If it's gas, it's one of two things. Either a ruptured FPR diaphragm (most likely) or a leaky/stuck open fuel injector (least likely).
    Sorry I wrote in the thread that it's now clearly showing its smoke. I don't know my way around the forum 100% yet. Lol

  5. #20
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    Re: Northstar Smoke On Startup

    Just pull the vacuum line off the FPR at idle and look for gas at or leaking from the nipple. There should be none.

  6. #21
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    Quote Originally Posted by Ranger
    Just pull the vacuum line off the FPR at idle and look for gas at or leaking from the nipple. There should be none.
    Thanks, shall do!

  7. #22
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    Quote Originally Posted by Ranger
    Just pull the vacuum line off the FPR at idle and look for gas at or leaking from the nipple. There should be none.
    I checked the regulator and no gas is getting by. It's now blowing so much smoke out on startup that I can't backup tell it dissipates. I have tried to start it with the peddle to the floor (Most cars that's clear flood mode, not sure on N*) and it does not help. #1 Injector has been screwing up and makes the lose slapping noise, so I switched it #1 and the problem followed if. No question it's bad, but can it be bad enough to cause so much smoke that I can't even see behind me? I have a hard time seeing that if its that bad that it would still run smooth as silk after the 30sec rough startup. Sorry to bother you.

  8. #23
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    Re: Northstar Smoke On Startup

    Quote Originally Posted by BONNEVILLEGXP View Post
    I have tried to start it with the peddle to the floor (Most cars that's clear flood mode, not sure on N*)
    Yes, that is clear flood mode, but if you have a stuck open injector, that won't help.

    I'd pull the fuel rail with the injectors attached. Have someone turn the key on to energize the fuel system and pressurize the fuel rail while you observe it. A leaky or stuck open injector will quickly reveal itself.

    No question it's bad, but can it be bad enough to cause so much smoke that I can't even see behind me?
    Sure, if it dumps enough fuel it doesn't get burned and wets the plug so it doesn't fire and the gas gets pumped out as a thick mist (vapor). You are not doing your CAT or cylinder walls any good either.

  9. #24
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    Quote Originally Posted by Ranger
    Yes, that is clear flood mode, but if you have a stuck open injector, that won't help.

    I'd pull the fuel rail with the injectors attached. Have someone turn the key on to energize the fuel system and pressurize the fuel rail while you observe it. A leaky or stuck open injector will quickly reveal itself.
    Once again, thanks! My common sense is still developing. Lol

  10. #25
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    Re: Northstar Smoke On Startup

    Quote Originally Posted by BONNEVILLEGXP View Post
    Once again, thanks! My common sense is still developing. Lol
    All part of the game. You're doing tons better than the vast majority of auto owners

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